related: fdo#77979: writerfilter RTF import: read encoded font name

The font name is encoded in the font's charset given by \fcharset.

(cherry picked from commit 04d5a280beeeb6e056df68395dc9c3b3a674361b)

Conflicts:
	writerfilter/source/rtftok/rtfdocumentimpl.cxx

(cherry picked from commit 790df682574eb4b3da9a973c3116b54d7666837c)

Conflicts:
	writerfilter/source/rtftok/rtfdocumentimpl.cxx

Change-Id: Id9520649a1eb3b55f4314e140abda7399f23d925
Reviewed-on: https://gerrit.libreoffice.org/9749
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>